- In fact, many of Acanthostega's features were undeniably fishlike.
- There was, however, one characteristic of Acanthostega that called to mind neither tetrapod nor fish.
- But not until 1987 did my colleagues and I finally find specimens revealing the postcranial skeleton of Acanthostega.
- In the 1990s, following the discovery of Acanthostega, researchers realized that a lower jaw collected in 1933 was that of a tetrapod.
- Indeed, evolutionary biologists have struggled to explain what transitional forms like Acanthostega did with their proto-limbs, if not locomote.